Question

when balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
charge
coefficient
random number
subscript

Explanation:

When balancing chemical equations, coefficients are used. A coefficient is a number placed in front of a chemical formula. It indicates the number of molecules or formula units of that substance involved in the reaction. For example, in the equation \(2H_2 + O_2
ightarrow 2H_2O\), the numbers \(2\) (in front of \(H_2\)) and \(2\) (in front of \(H_2O\)) are coefficients. They help in making sure that the number of atoms of each element is the same on both sides of the equation (law of conservation of mass).

A charge is related to the electrical state of an ion (e.g., \(Na^+\) has a +1 charge). A subscript is a number within a chemical formula (e.g., in \(H_2O\), the \(2\) is a subscript indicating 2 hydrogen atoms bonded to 1 oxygen atom). A random number has no place in the systematic process of balancing equations as we follow the law of conservation of mass.

Answer:

B. coefficient